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Finding the Fourth Proportional to 817,858, 1,128,631.89 and 455,281.21

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Solution

The fourth proportional to 817,858, 1,128,631.89 and 455,281.21 is: 628,281.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    817,858 : 1,128,631.89 = 455,281.21 : x
  2. Step 2: Convert to fraction form
    817,858/1,128,631.89 = 455,281.21/x
  3. Step 3: Cross multiply
    817,858x = 1,128,631.89 × 455,281.21
  4. Step 4: Simplify right side
    817,858x = 513,844,892,523.79
  5. Step 5: Solve for x
    x = 513,844,892,523.79/817,858
  6. Step 6: Final answer
    x = 628,281.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.